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'use strict';
const common = require('../common');
const assert = require('assert');
const dgram = require('dgram');
const util = require('util');
const networkInterfaces = require('os').networkInterfaces();
const Buffer = require('buffer').Buffer;
const fork = require('child_process').fork;
const LOCAL_BROADCAST_HOST = '255.255.255.255';
const TIMEOUT = common.platformTimeout(5000);
const messages = [
new Buffer('First message to send'),
new Buffer('Second message to send'),
new Buffer('Third message to send'),
new Buffer('Fourth message to send')
];
if (common.inFreeBSDJail) {
console.log('1..0 # Skipped: in a FreeBSD jail');
return;
}
// take the first non-internal interface as the address for binding
get_bindAddress: for (var name in networkInterfaces) {
var interfaces = networkInterfaces[name];
for (var i = 0; i < interfaces.length; i++) {
var localInterface = interfaces[i];
if (!localInterface.internal && localInterface.family === 'IPv4') {
var bindAddress = localInterface.address;
break get_bindAddress;
}
}
}
assert.ok(bindAddress);
if (process.argv[2] !== 'child') {
const workers = {};
const listeners = 3;
let listening = 0;
let dead = 0;
let i = 0;
let done = 0;
let timer = null;
//exit the test if it doesn't succeed within TIMEOUT
timer = setTimeout(function() {
console.error('[PARENT] Responses were not received within %d ms.',
TIMEOUT);
console.error('[PARENT] Fail');
killChildren(workers);
process.exit(1);
}, TIMEOUT);
//launch child processes
for (var x = 0; x < listeners; x++) {
(function() {
var worker = fork(process.argv[1], ['child']);
workers[worker.pid] = worker;
worker.messagesReceived = [];
//handle the death of workers
worker.on('exit', function(code, signal) {
// don't consider this the true death if the worker
// has finished successfully
// or if the exit code is 0
if (worker.isDone || code == 0) {
return;
}
dead += 1;
console.error('[PARENT] Worker %d died. %d dead of %d',
worker.pid,
dead,
listeners);
if (dead === listeners) {
console.error('[PARENT] All workers have died.');
console.error('[PARENT] Fail');
killChildren(workers);
process.exit(1);
}
});
worker.on('message', function(msg) {
if (msg.listening) {
listening += 1;
if (listening === listeners) {
//all child process are listening, so start sending
sendSocket.sendNext();
}
}
else if (msg.message) {
worker.messagesReceived.push(msg.message);
if (worker.messagesReceived.length === messages.length) {
done += 1;
worker.isDone = true;
console.error('[PARENT] %d received %d messages total.',
worker.pid,
worker.messagesReceived.length);
}
if (done === listeners) {
console.error('[PARENT] All workers have received the ' +
'required number of ' +
'messages. Will now compare.');
Object.keys(workers).forEach(function(pid) {
var worker = workers[pid];
var count = 0;
worker.messagesReceived.forEach(function(buf) {
for (var i = 0; i < messages.length; ++i) {
if (buf.toString() === messages[i].toString()) {
count++;
break;
}
}
});
console.error('[PARENT] %d received %d matching messges.',
worker.pid,
count);
assert.equal(count, messages.length,
'A worker received an invalid multicast message');
});
clearTimeout(timer);
console.error('[PARENT] Success');
killChildren(workers);
}
}
});
})(x);
}
var sendSocket = dgram.createSocket({
type: 'udp4',
reuseAddr: true
});
// bind the address explicitly for sending
// INADDR_BROADCAST to only one interface
sendSocket.bind(common.PORT, bindAddress);
sendSocket.on('listening', function() {
sendSocket.setBroadcast(true);
});
sendSocket.on('close', function() {
console.error('[PARENT] sendSocket closed');
});
sendSocket.sendNext = function() {
var buf = messages[i++];
if (!buf) {
try { sendSocket.close(); } catch (e) {}
return;
}
sendSocket.send(
buf,
0,
buf.length,
common.PORT,
LOCAL_BROADCAST_HOST,
function(err) {
if (err) throw err;
console.error('[PARENT] sent %s to %s:%s',
util.inspect(buf.toString()),
LOCAL_BROADCAST_HOST, common.PORT);
process.nextTick(sendSocket.sendNext);
}
);
};
function killChildren(children) {
Object.keys(children).forEach(function(key) {
var child = children[key];
child.kill();
});
}
}
if (process.argv[2] === 'child') {
var receivedMessages = [];
var listenSocket = dgram.createSocket({
type: 'udp4',
reuseAddr: true
});
listenSocket.on('message', function(buf, rinfo) {
// receive udp messages only sent from parent
if (rinfo.address !== bindAddress) return;
console.error('[CHILD] %s received %s from %j',
process.pid,
util.inspect(buf.toString()),
rinfo);
receivedMessages.push(buf);
process.send({ message: buf.toString() });
if (receivedMessages.length == messages.length) {
process.nextTick(function() {
listenSocket.close();
});
}
});
listenSocket.on('close', function() {
//HACK: Wait to exit the process to ensure that the parent
//process has had time to receive all messages via process.send()
//This may be indicitave of some other issue.
setTimeout(function() {
process.exit();
}, 1000);
});
listenSocket.on('listening', function() {
process.send({ listening: true });
});
listenSocket.bind(common.PORT);
}
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